The phrase começar a meteção comes from Brazilian Portuguese slang, where meteção is used playfully for partying, dancing and getting into mischief. Online the clip circulates as a short reaction sound, shared in edits and messaging apps when someone wants to signal that the fun is officially starting. Its appeal is the instant cultural shorthand, understood without explanation by Portuguese speaking audiences. It keeps being reused because the delivery works as a standalone punchline, a transition, and a caption in audio form for chaotic social moments.